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Unread 07-30-2010, 10:57 AM   #1
MartinTravels
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Stock Jeep Wobbles at 50 MPH

I have a 2006 Wrangler X. It has about 23K miles on it. It is a 6 speed transmission with the 4.0 engine, and the Jeep is completely stock. At 50 MPH, the jeep vibrates. It vibrates with or without the top down. It vibrates uphill, downhill and on flat road (I think it is worse downhill). It really wobbles when the transmission is in gear (it is worse when power is to the tires). When coasting at 50 MPH, it seems the vibration almost completely vanishes.

It is only for a very brief window at exactly 50 MPH that this wobble happens, but it is enough for concern. Any body else had this issue? Any ideas on a fix? Thanks in advance for all the suggestions.

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Unread 07-30-2010, 11:03 AM   #2
KEH1997
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Sounds like a wheel imbalance to me... Mine does the same thing, and that's what my problem is.
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Unread 07-30-2010, 11:07 AM   #3
Piratejonh
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Whats vibrating? The whole jeep or the steering wheel?
Have you done anything to the jeep prior to this symptom?
Ever go off road? Mud or rocks?
Your profile says totally stock. Maybe a wheel weight was knocked off. Look on the wheels edges for a clean spot. If you've been in the mud maybe its packed in your wheel throwing it off.
Vibrating under load but not while coasting might be a driveline problem.. Seems early for a U-joint to be going bad- unless you go off road. And on that note its unlikely you control arm bushings are going bad.
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Unread 07-30-2010, 11:09 AM   #4
McKBrew
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From everything I have read, pretty much all wobbles related to certain speeds are a result of tire imbalance.

I've heard a couple different recommendations including balancing with airsoft BB's or Road Force balancing which is offered by some tire shops.
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Unread 07-30-2010, 11:27 AM   #5
MartinTravels
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I have never taken it off road and have done nothing to it other than gas in the tank and removing the top and doors. I will check the wheels to see determine if a weight has fallen off... I just don't know.
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Unread 07-30-2010, 11:33 AM   #6
tim87114
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Martin, the important question from above, is does the steering wheel shake? Meaning do you feel the "vibration" in the steering wheel or do you mean you feel it in your foot or tub of the jeep?

Front end vibration on jeeps is common enough if you look at it as Death Wobble or DW as referred to here on the forum. It can happen to any jeep at any given mileage for different reasons.
I agree that tire balance is the first place to look. Beyond that, you would be standing in line with the rest of us guys running a stock jeep wondering what the heck is going on.
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Unread 07-30-2010, 11:35 AM   #7
TheBoogieman
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Rotate and balance the tires.
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Unread 07-30-2010, 11:37 AM   #8
TheBoogieman
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Quote:
Originally Posted by McKBrew View Post
Road Force balancing which is offered by some tire shops.
I would agree if he had 35's,but his little tires can be balanced right on any machine.
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Unread 07-30-2010, 11:48 AM   #9
MartinTravels
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Just to clarify, I feel it in the steering wheel. The steering wheel shakes back and forth. But the real oddity is that it does not shake while coasting. I would assume it it was a wheel balance issue the wobble would occur in neutral at 50 MPH as well as when in gear at 50 MPH.
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Unread 07-30-2010, 11:59 AM   #10
spillz
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Martin...Martin here

Martin.....

I had the exact same issues with my stock 2006 LJ with 29k miles on it. I took my LJ to a local tire shop had the tires balance and rotates. Problem solved.......wheel was out of balance....
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Unread 07-30-2010, 12:25 PM   #11
bobthetj03
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So if you put the clutch in or throw it in neutral while at 50 mph the wobble vanishes? Is the wobble in the steering wheel or do you feel it in the seat?

Sorry, took too long to post. Questions answered. Sounds like tire balance to me. I have the same shimmy at 50 and I've went to 3 different shops and had all four balanced 3 times till the 3rd shop got it close. Still shimmys a little but is better.
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Unread 07-30-2010, 06:39 PM   #12
MartinTravels
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I took the rig to the local Les Schwab here in Monroe, WA (BTW, I have received EXCELLENT customer service every time I go there). They quickly identified the problem as a missing weight on the right front tire. They balanced the tire, aired it up and checked the balance and air on the remaining three.

Twenty six dollars later the problem is solved! Thanks to all who posted on this thread... you were all right!
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Unread 07-30-2010, 10:29 PM   #13
McKBrew
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Right on. Glad that helped.
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Unread 07-30-2010, 11:06 PM   #14
imhere631
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some times the balancing weights on the drive shaft can get thrown. Look to see if you have a spot that might indicate that the driveshaft is out of balance.
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Unread 07-31-2010, 12:49 AM   #15
SugarBear
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Quote:
Originally Posted by MartinTravels
At 50 MPH, the jeep vibrates. It vibrates with or without the top down.
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